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Title: Proton bunch self-modulation in plasma with density gradient
Authors: Braunmuller, F.
Nechaeva, T.
Adli, E.
Agnello, R.
Aladi, M.
Andrebe, Y.
Apsimon, O.
Apsimon, R.
Bachmann, A. -M.
Baistrukov, M. A.
Batsch, F.
Wing, M.
Wolfenden, J.
Woolley, B.
Xia, G. X.
Zepp, M.
Della Porta, G. Z.
Bergamaschi. M.
Blanchard, P.
Burrows, P. N.
Buttenschön, B.
Caldwell, A.
Chappell, J.
Chevallay, E.
Chung, M.
Cooke, D. A.
Damerau, H.
Davut, C.
Demeter, G.
Deubner, L. H.
Dexter, A.
Djotyan, G. P.
Doebert, S.
Farmer, J.
Fasoli, A.
Fedosseev, V. N.
Fiorito, R.
Fonseca, R. A.
Friebel, F.
Furno, I.
Garolfi, L.
Gessner, S.
Goddard, B.
Gorgisyan, I.
Gorn, A. A.
Granados, E.
Granetzny, M.
Grulke, O.
Gschwendtner, E.
Hafych, V.
Hartin, A.
Helm, A.
Henderson, J. R.
Howling, A.
Hüther, M.
Jacquier, R.
Jolly, S. W.
Kargapolov, I. Y.
Kedves, M. Á.
Keeble, F.
Kelisani, M. D.
Kim, S. -Y.
Krausz, F.
Krupa, M.
Lefevre, T.
Militsyn, B. L.
Liang, L.
Liu, S.
Lopes, N. C.
Lotov, K. V.
Martyanov, M.
Mazzoni, S.
Godoy, D. M.
Minakov, V. A.
Moody, J. T.
Morales Guzmán, P.  I.
Moreira, M. T.
Muggli, P.
Panuganti, H.
Pardons, A.
Peña Asmus, F.
Perera, A.
Petrenko, A.
Pucek, J.
Pukhov, A.
Ráczkevi, B.
Ramjiawan, R. L.
Norreys, P.
Ruhl, H.
Saberi, H.
Schmitz, O.
Senes, E.
Sherwood, P.
Silva, L. O.
Spitsyn, R. I.
Tuev, P. V.
Turner, M.
Velotti, F.
Verra, L.
Verzilov, V. A.
Vieira, J.
Welsch, C. P.
Williamson, B.
Issue Date: 2020
Publisher: American Physical Society
Abstract: We study experimentally the effect of linear plasma density gradients on the self-modulation of a 400 GeV proton bunch. Results show that a positive or negative gradient increases or decreases the number of microbunches and the relative charge per microbunch observed after 10 m of plasma. The measured modulation frequency also increases or decreases. With the largest positive gradient we observe two frequencies in the modulation power spectrum. Results are consistent with changes in wakefields' phase velocity due to plasma density gradients adding to the slow wakefields' phase velocity during self-modulation growth predicted by linear theory.
Peer reviewed: yes
DOI: 10.1103/PhysRevLett.125.264801
ISSN: 0031-9007
Accession number: WOS:000602858400007
Appears in Collections:CTI-RI - Artigos em revistas científicas internacionais com arbitragem científica

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